I'm so confused, wiring the actuator up as a switch as shown in diagram 3 makes the central locking not work and the motor only move small amounts. The actuator had 3 wires, 1 live and two negatives, when the switch moved it completed the circuit through one of the negatives. I have tried putting a live through one of the, but it doesn't work every time. I don't understand how it can work some of the time.